(function (window, document) {
    var tetherchatwindow;
    var isOpened = false;
    var isFullScreen = false;
    var openImg = 'https://mxco-production-tether.s3.us-west-2.amazonaws.com/r2k84z8/24/open-xs.png';
    var closeImg = 'https://mxco-production-tether.s3.us-west-2.amazonaws.com/r2k84z8/25/close-xs.png';

    function resizeIframe() {
        isFullScreen = window.innerHeight < 600 || window.innerWidth < 600;

        if (isFullScreen && isOpened) {
            tetherchatwindow.style.bottom = '0';
            tetherchatwindow.style.right = '0';
            tetherchatwindow.style.top = '0';
            tetherchatwindow.style.left = '0';
        } else {
            tetherchatwindow.style.bottom = '70px';
            tetherchatwindow.style.right = '10px';
            tetherchatwindow.style.top = 'unset';
            tetherchatwindow.style.left = 'unset';
        }

        if (isOpened) {
            if (isFullScreen) {
                tetherchatwindow.style.height = window.innerHeight - 70 + 'px';
                tetherchatwindow.style.width = window.innerWidth + 'px';
            } else {
                tetherchatwindow.style.height = '400px';
                tetherchatwindow.style.width = '302px';
            }
        } else {
            tetherchatwindow.style.height = '0px';
            tetherchatwindow.style.width = '0px';
        }
    }

    function toggleChatWindow() {
        isOpened = !isOpened;

        document.getElementById('tether_chat_toggle').src = isOpened ? closeImg : openImg;

        resizeIframe();
    }

    function main(experience) {
        var domain = 'pages.tetherxmp.com'.indexOf('_') >= 0 ? 'pages.tetherxmp.com' : 'pages.tetherxmp.com';
        tetherchatwindow = document.createElement('iframe');
        tetherchatwindow.src = '//' + domain + '/e/' + experience;
        tetherchatwindow.style.width = '50px';
        tetherchatwindow.style.height = '50px';
        tetherchatwindow.style.position = 'fixed';
        tetherchatwindow.style.bottom = '60px';
        tetherchatwindow.style.right = '10px';
        tetherchatwindow.style.border = 'none';
        tetherchatwindow.style.zIndex = 9999999;
        tetherchatwindow.frameborder = "0";
        tetherchatwindow.scrolling = "no";
        tetherchatwindow.onload = function () { resizeIframe(); };
        document.body.appendChild(tetherchatwindow);
        tctoggle = document.createElement('img');
        tctoggle.id = 'tether_chat_toggle';
        tctoggle.src = 'https://mxco-production-tether.s3.us-west-2.amazonaws.com/r2k84z8/24/open-xs.png';
        tctoggle.style.width = '50px';
        tctoggle.style.height = '50px';
        tctoggle.style.position = 'fixed';
        tctoggle.style.bottom = '10px';
        tctoggle.style.right = '10px';
        tctoggle.style.border = 'none';
        tctoggle.frameborder = "0";
        tctoggle.zIndex = 999999999;
        tctoggle.scrolling = "no";
        document.body.appendChild(tctoggle);
        tctoggle.onload = function () {
            document.getElementById('tether_chat_toggle').addEventListener('click', toggleChatWindow);
        };
        window.addEventListener('resize', resizeIframe);
    };

    if (typeof window[window.TetherCTA] === 'function') {
        main(window[window.TetherCTA].q[0][0]);
    } else {
        window[window.TetherCTA] = main;
    }
})(window, document)